<header>
  <nav class="navbar navbar-expand-md bg-dark">
    <div class="navbar-brand"><a routerLink="https://google.com">Brand</a></div>
    <ul class="navbar-nav">

    </ul>

    <ul class="navbar-nav navbar-collapse justify-content-end">
      <li style="margin-right: 2em"><a routerLink="/welcome" class="navbar-link">Home</a></li>
      <li><a routerLink="/product" class="navbar-link">Product</a></li>
      <li style="margin-right: 2em; margin-left: 2em"><a routerLink="/login" class="navbar-link">Login</a></li>
      <li><a routerLink="/logout" class="navbar-link">Logout</a></li>
    </ul>
  </nav>
</header>
